Quiescence
D.Divya
2021005022
Introduction
Quiescence is a period during which the embryo is dormant and has no
activity
 In this phase embryo in seed have stopped growing
 It is the inability of a non dormant seed to germinate due to a lack of
suitable germinating conditions
 This phase is triggered by the absence of favourable factors such as
light , temperature and moisture
 The rate of cell division is suppressed
 The embryo resume it growth under favorable condition
Importance
 It is very important in the maintenance of stem cell population loss
of which can result in premature aging
 It occurs in fast growing plants
 Eg green leafy vegetables
 It require relatively very short time
 Quiescent centre are found in root meristem
 It found mainly at the tips of growing roots in root meristem
 It can be reversed upon the return of suitable conditions
Quiescent phase in cell division
Quiescent phase is the stage wherein cells remain
metabolically active but donot profilerate unless called to
do so
Such cells are used for replacing the cells lost during
injury
Similarities between dormancy
Both are delayed seed germination
Both prevent seed germination during the unfavorable
conditions
They increase the probability of seedling survival
Both are important for plant ecology and agriculture

Thank you

QUIESCENCE SST.pptx

  • 1.
  • 2.
    Introduction Quiescence is aperiod during which the embryo is dormant and has no activity
  • 3.
     In thisphase embryo in seed have stopped growing  It is the inability of a non dormant seed to germinate due to a lack of suitable germinating conditions  This phase is triggered by the absence of favourable factors such as light , temperature and moisture  The rate of cell division is suppressed  The embryo resume it growth under favorable condition
  • 4.
    Importance  It isvery important in the maintenance of stem cell population loss of which can result in premature aging  It occurs in fast growing plants  Eg green leafy vegetables  It require relatively very short time
  • 5.
     Quiescent centreare found in root meristem  It found mainly at the tips of growing roots in root meristem  It can be reversed upon the return of suitable conditions
  • 6.
    Quiescent phase incell division Quiescent phase is the stage wherein cells remain metabolically active but donot profilerate unless called to do so Such cells are used for replacing the cells lost during injury
  • 7.
    Similarities between dormancy Bothare delayed seed germination Both prevent seed germination during the unfavorable conditions They increase the probability of seedling survival Both are important for plant ecology and agriculture
  • 9.